Definitions from Wiktionary ( )

▸ noun:  An almost transparent aquatic animal; any one of the acalephs, especially one of the larger species, having a jellylike appearance.
▸ noun:  Any of various species of cnidarians in the subphylum Medusozoa, including box jellyfish (class Cubozoa), true jellyfish (class Scyphozoa), stalked jellyfish (class Staurozoa), and certain hydrozoans.
▸ noun:  (especially) The medusa phase of these animals rather than a younger life stage.
▸ noun:  A ctenophore, a member of the phylum Ctenophora (comb jellies).
▸ noun:  A sudoku technique involving possible cell locations for a digit, or pair, or triple, in uniquely four rows and four columns only. This allows for the elimination of candidates around the grid.

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